254. Show me an anthropologist who defines "American" as an ethnic group.

Anywhere. (It's not my field but a quick perusal of such of the recent literature as is available on Google Scholar talks of "American ethnic groups", "maintenance of ethnic identity by descendants of immigrants", and so on; you are very much wrong in claiming "American" is an ethnicity; when it's pointed out that you're wrong you proceed to wave your metaphorical dick around ("I have a background in anthropology", lol); you're apparently so childishly incapable of being told you're wrong that you go "waah, I'm putting you on ignore!" to get the last word...which is pretty fucking lame, sorry.